Packing-ring expander.



M. F. COX.

PACKING RING EXPANDER. APPLICATION FILED JUNE I8. ISII.

Patented Sept. 16, 1919.

2 SHEETS-SHEET l.

M. F. cox. PACKING RING EXPANDER.

APPLICATION FILED .IUNE I8. 191?.

Patented Sept. 16, 1919.

2 SHEETS-SHEET 2.

Strom/mts 5,

UNITED STATES PATENT OFFICE.

. MILLALBLD F. COX, 0F LOUISVILLE, KENTUCKY.

PACKING-RING EXPANDERk Specification of Letters Patent.

Patented Sept. 16, 1919.

Application led June 18, 1917. Serial No. 175,485.l

tween a stationary part and a movable part,-

as for example, between a pistonand itscylinder. l j

Other objects and advantages of this inventionwill become apparent hereinafter, it being understood that changes in form, proportion and minor details of construction may be resorted to without departing' from the spirit ofthe invention or sacrificing any of the advantages thereof.

In the drawing Figure 1 is aplan view of a packing ring constructed in accordance withv my invention.

Fig. 2 is a sectionall view on the line 2-2 of Fig. 1.

Fig. 3 is-a sectional view on the line 3 3 of F ig. 1.

Fig. 4 is a fragmentary view of one ofthe ends .of the ring. i Y

Fig. 5 is a fragmentary sectional view through. al portion of a cylinder, piston and packing, and

,Figs 6- to 18, both inclusive, are detail sectional views through different forms of the ring.

lI have selected the form ofring shown lin, Figs. 1 to 6, as the preferred'form, and this consists of a ring 1, folded and pressedfrom a single piece of sheet metal, as for example steel, into concave-convex cross sectional form, the metalv 4being doubled back upon itself tol form a double wall, although it is not necessary to follow this procedure in all the forms. at least one of the'walls thereof is under tension when applied to the packing, as for example between the piston 2 and the packing '3 to insure a Vclose contact between the packing and the'cylinder l4. .Of course, both walls of the ring 'may be under tension, but

'this is notnecessary under all 'conditions Inasmuch as the rings are adapted to be The ring is so constructed that sold separate from the engine, compressor or other `devicewith'which they maybe used, it is desirable that `the ends 5 and 6 do not sprlng apart, as they make a better `appearance if they 'retain their circular shape. To this end, the inner Walls of the spaced ends 5 and 6 arev folded inwardly toward the outer-walls as at 7 and 8 so as to form guidesfforthedowel or pin 9 preferl ably fastened at one end to one of the bent over walls' and slidable rin the guide formed -by the other, whereby a slip joint 1s provided. This also assists in placing the rings in position, as the ends 5 an 6 cannot spring apart a sufficient distance to destroy the circular formatlon of the ring. Holes or openings 10/may be provided for the purpose of lubrication. I have shown the wall of the ring in Figs. l to 5 as of slightly less height than the outer wall. Thepurpose of thls will be apparent by reference to Fig. 5, from which it will be seen that the inner wall {itsunder the top of the piston head, while the outer or higherwal/lis free tobear agam'st the packing 8 and thereby causeit to bear snugly againstthe cylinder 4. In the particular instance just described, the higher' or outer wall will have suiiicientcompression against the packing -to accomplish the end desired.

In Fig. 7, the metal is doubled upon itself for the entire distance instead of partially, as Shown in Fi 1to,6, so that the walls 11 and 12 are osthe same thickness.

In-Fig. 8, the higher wall 13 is formed with a .lateral projection or bracing flange 14 at its upper edge to provide rigidity and' strength to said wall.

Fig. 9, illustrates a spring wall 15 as circular, and in this case, both the wall 15 and the one designatedl are of single thickness.

Fig; l0 discloses al vertical wall 17 4of sin-` gle thickness and .alaterally'curved wall 18 of double thickness, the, end of the'wall 18 being spaced from the wall 17.

11 shows a construction similar to that shown in Fig. 10, but in this case, the end of the curved wall-19 is-close to the ver-` tical wall 20.

In'Fig.'12 the vertiealwall 21 is'provided with. an outwardly .turned flange 22 of singleV thickness, while the curved'wall 23,is double.

Fig. 13 shows a verticalwall 24 of sin le thickness and a circular .wall 25 of dou le thickness. Y

ci Leichen In Fig. 14, I have shown a 'construction similar to that shown in Fig. 6 with an inbent lateral bracing flange 26.

Fig. 15 is similar to Fi. 6, but provided '5' at the free ends .of the wa 1s 27 and 28 with' lateral bracing flanges 29 and 30.

In Fig. 16, the ring consists of. a vertical wall 31 and acircular wall 32, both of sin ,gle thickness, but in this form, the circularv 10 `Wall is not partially coiled as in Fig. 9.

upper edge.

Inthose forms of ringsusceptible to employin the slip joint, I prefer to bend over the wa 1s adjacent to the ends thereof, al- 20 though the slip joint is not essential in all cases.

I claim:- l

1. A packing expander comprising a concave and convex ring of channel form c011- structed 'with folded walls presenting -aj doublethickness and a lateral flange projecting frolnone of the walls of said ring.

2. A packing expander comprising a folded sheet constructed of meta-lrolled to channel form and having lateral iianges on the longitudinal edges ofthe sheet.

In testimony whereof the foregoing Speciication ,is signed 'at Louisville, -Ke`ntucky, this thday of Oct., 1916.

, s MILLARD COX. 

